his is about Stevens’ typology of scales and most of the time it’s a red herring in our change measurement.
Interval scaling means that the intervals between scores are mathematical but the ratios are not. The only example in our realm (and hardly in our realm really) is temperature in Celsius/centigrade or Fahrenheit. Each has the property that a temperature of 30 degrees is as much hotter than 20 degrees as 20 degrees is hotter than 10 degrees but in neither scale is 20 degrees twice as hot as 10 degrees: because the zero values are arbitrary.
Try also #
Chapters 2, 4 and 10?